Button Drill Bit from Factory with Great Price

4'' Button drill Bit From Factory with Great Price
Dia.: ø108, ø115, ø121, ø127, ø130 mm
Spline: 6, 8,10, 12
Type: DHD340, SD4, Mission40, QL40, Wooke40

Bit Head Design and selection:
1. Flat front Spherical
Application: For Drilling in hard and abrasive rock.
2. Flat front Spherical + Ballistic
Application: For Drilling in medium-hard to hard and moderately abrasive rock.
3. Convex front Spherical + Ballistic
Application: For drilling in medium-hard and moderately abrasive rock.
4. Convex front Ballistic
Application: For drilling at high penetration rates in non-abrasive rock.
5. Concave front Spherical.
Application: For drilling in medium-hard, minimum hole deviation control